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This error is generated if you try to check a trivial event for null (the event name will no longer provide direct access to the backing store delegate for the event). Ex:

// compile with: /clr /c
using namespace System;
public delegate int MyDel(int);

interface struct IEFace {
   event MyDel ^ E;

ref struct EventSource : public IEFace {
   virtual event MyDel ^ E;
   void Fire_E(int i) {
      if (E)   // C3918

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